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Re: Miss fire when climing hill
P0300 DTC along with a flashing SES light is almost always caused by secondary ignition failures: Spark plugs, spark plug wires, distributor cap and rotor, ignition coil. Always use AC Delco plugs, cap and rotor in the 4.3L, they are very fussy. Put a dab of silicone dielectric grease on each terminal, inside and out, of the distributor cap. Post your results.
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